Students, let me guess a riddle for you first: say that a tiger is not a tiger, climb freely on the wall, stay on the house and catch a flying general. Guess what this is? Yes, it's a gecko.

Gecko, usually called Toka purple, is a gray night reptile. Sleep in the corner during the day and come out for food at night. It mainly preys on mosquitoes, flies, moths and other small insects. A gecko can eat many pests in one night. So it is an animal that is beneficial to human beings. Gecko's head is pointed like a triangle; Small eyes; Wearing a layer of scales, the colors are deep and light; Four short legs, its claws are like plum blossoms, and it has a slender tail.

Gecko has a flat body, short limbs and suckers on its toes. It can crawl on the wall. When it crawls, its five toes are spread apart, holding the wall tightly, its abdomen is close to the wall, and its slender tail swings left and right with the crawling speed.

One night, I saw a gecko catching mosquitoes on the glass window. I thought: Gecko's kung fu is really good. It can easily climb back and forth on the glass window without slipping. Besides, as far as I know, they can walk back and forth on the ceiling or come and go freely. It's amazing! In addition to admiration, I also have a question. The glass is smooth. Why don't geckos fall off when they walk on it repeatedly? Gecko walks on his back on the ceiling. Why doesn't it fall?

In order to find out this problem, with the help of my parents, I specially caught a gecko and put it in a glass to observe it carefully. I also took a magnifying glass to observe and found that every toe of the gecko is like a "step" and a little like a "V". How strange! Do geckos grasp the glass by the V-shaped "steps" on the soles of their feet?

In order to further understand the reason why gecko crawls on the smooth glass, I asked my parents. They say that this is because the gecko has circles of rough things on its feet, called toes, so it can climb up walls and glass. In order to make the answer more accurate, I asked the computer teacher. The teacher said that the V-shaped steps I observed were many horizontal folds formed by the skin under the gecko's toes. These horizontal folds were made up of many thin slices with many glandular hairs on them. The tip of glandular hair can secrete liquid. These glandular hairs are attached to the glass wall like felt, with strong adhesion.

I am very excited after knowing the answer. It turns out that by discovering, observing and looking for information, we can explain phenomena that we can't understand. Life is a science for us. Only by discovering more, observing more, thinking more and learning more can we constantly enrich ourselves!